Longwall Top-Coal Caving: A productive and efficient alternative In the right conditions, longwall mining is one of the safest, most productive and most efficient ways to produce coal.
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Longwall Top Coal Caving (LTCC) is a special designed longwall mining method for very thick seams (thickness is more than 4.5m) where good quality coal is being left because "conventional" longwall equipment has not yet been designed to operate successfully beyond around 5m mining height.
Longwall top coal caving (LTCC) is a special type of longwall mining applicable to very thick seams (greater than 4.5m) where good quality coal is being left because "conventional" longwall equipment has not yet been designed to operate successfully beyond around 5m mining height.
Developed in China, top coal caving uses a modified long wall mining system. LTCC allows the excavation of thick coal seams of 5 to 12 metres at one pass of the longwall machine, generating high productivity and economic returns for an operation.
A brief description of longwall top coal caving (LTCC) is included at the end of the Longwall section of the Fundamentals of Coal Mining module of this web site.
Coal has been produced by means of longwall retreat with the top-coal-caving production method where a 2.8 m high longwall face was operated at the floor of the coal seam (Fig. 4). Top-slice coal having a thickness of 5.2 m was caved and produced through windows located at the top of the shields. Download : Download full-size image Fig. 3.